Firearm trigger mechanism



Aug. 21, 1951 A' B GE I FIREARM TRIGGER MECHANISM Filed Aug. 26, 1949 Patented Aug. 21, 1951 UNITED STATES PATENT OFFHCI FIREARM TRIGGER MECHANISM Arthur B. Cubbage, Los Angeles, Calif. Application August 26, 1949, Serial No. 112,447

Claims. 1

The primary purpose of this invention is to provide firearm trigger mechanism which is an improvement over trigger mechanisms heretofore produced in point of simplicity of construction, compactness, ready applicability to various types of bolt action fire arms, and reliability and safety of performance to achieve a quick action of the firing mechanism responsive to such a comparatively easy pull and small amount. of movement of the trigger that there will be little likelihood of the piece being thrown ofi aim when actuating the trigger.

A further purpose is to provide a trigger mechanism in which the advantages aiTorded thereby are achieved by means of a rotary and springloaded sear member having two sears, one for contacting the spring loaded trigger to positively hold the rotary member against turning and the other for holding the spring-loaded hammer of the piec in cocked position while the rotary member is held against turning and which when the trigger is pulled to release the rotary member, will under the spring load on the hammer turn the rotary member, and thus move clear of the hammer as the latter completes its firing stroke; and wherein the spring load on th rotary member returns the rotary member to cooking position with respect to the hammer when the firing stroke of the latter is completed, and wherein the spring load on the trigger returns the trigger to cooked or holding position upon return of the rotary member to said cocking position.

An important provision of this invention is that the trigger and associated members are constructed and arranged to positively hold the fire ing mechanism against being accidentally or unintention-ally actuated for example as a result of jarring of the mechanism, yet will release the firing mechanism with a comparatively short movement of the trigger under a very light pull, thereby affording the desired quick, and easy trigger action with an equally desirable safety factor.

With the foregoing objects in view, together with such other objects and advantages as may subsequently appear, the invention resides in the parts and in the combination, construction and arrangement of parts hereinafter described and claimed, and illustrated by way of example in the accompanying drawing, in which:

Fig. 1 is a. fragmentary vertical sectional View of the trigger mechanism embodying the present invention as when the hammer is cocked,

Fig. 2 is a view similar to Fig. 1 showing hoW the trigger mechanism releases the hammer,

Fig. 3 is a sectional view taken on line 3-3 of Fig. 1, and

Fig. 4 is a sectional view taken on the line 4-4 of Fig. 1.

As shown in the accompanying drawing A designates that portion of a bolt action rifle in which are housed and arranged in the usual manner, the hammer or bolt B, the firing pin 0 and the actuating spring D therefor, there being a frame or housing E depending from the part A for supporting the trigger mechanism of my invention.

In accordance with the present embodiment of my invention, a circular, disk-like sear-supporting member 4 is mounted in the housing E to rotate on a, pin 5 fixed non-rotatably in the housing as by means of the fastening B and key 6. On this rotary member is a fixed trigger-contacting sear l and a pivoted hammer-contacting sear 8. The scar 1 is integral with member 4 and projects laterally from the periphery thereof and has a straight and fiat sear face 9 radial to the member 4 and adapted for a square contact with the upper square end III of a spring-loaded trigger I l pivoted on a pin l 2 in the housing E. The purpose of sear is to hold the rotary sear-carry- -ing member 4 against rotation and subject to release when the trigger is pulled.

A spring l3 abuts the trigger II and yieldingly holds it in the cooked position shown in Fig. 2, being held in place by a keeper [4 loosely mounted on a screw l5 adjustably mounted on the housing E. A nut l6 holds the screw IS in desired adjusted position so that the inner end of the screw acts as a stop to limit the releasing movement of the trigger. The member 4 has a shoulder portion I! which abuts the trigger to limit the movement thereof under the urge of the spring, to the particular holding contact with the sear face 9 as shown in Fig. 1.

The pivoted sear 8 is mounted in a recess l8 in the rotary member 4 on a pivot pin l9 and has a square sear face 20 on one end thereof for contact with a fixed sear member 2| on the hammer B to hold the hammer in cocked position when the rotary member 4 is held against turning by means of the sear 1 and trigger I I. Coacting stop portions 22 and 23 on the sear 8 and member 4 respectively limit the outward movement of the sear to hammer-holding position as shown in Fig. 1. A spring 24 mounted in the recess l8 bears against the sear 8 to yieldingly hold it in hammer-holding position.

A spiral spring 25 is mounted in a recess 26 in a side of the member 4 and has one end fixed as at 21 on the pin 5 and its other end fixed on a pin 28 fixed on the member 4, for the purpose of returning the member 4 to position for holding the hammer cocked. Coacting stop members 29 and 30 on the member 4 and housing E limit the return movement of the member 4.

Fig. 1 shows in full lines the positions taken by the parts of the trigger mechanism when the hammer is cooked and so held, it being noted that the sear 8 has a positive square contact with the companionrsear member 2! on the hammer whereas the sear 1 likewise has a square contact with the upper end of the trigger i l.

The heavy spring D of the firing mechanism, through the contact of the sear member 21 with sear 8 tends to turn the rotary member 4 but the sear 1 in abutting the top end it of the trigby holding the hammer in cocked position.

As shown in Fig. 2, the sear member '21 on the hammer clears the sear 8 when the hammer has completed its firing stroke, at which time the spiral spring 25 acts to turn the member 4 to a position inwhich the stop 25 contacts stop 36 as shown in dotted lines in Fig. 2 and in which the sear '1 "is in the dotted position shown in Fig. l with its sear face 9 well above the plane of the end ID of the trigger to insure that the trigger will be moved to a position with the end 10 directly under the sear 7. Upon now cooking the hammer the sear member 2| rides on the curved outerface of the sear B and depresses the sear so that when cooking position is reached the sear 8 will spring outwardly in front of sear member 2| and assume the holding position shown in full lines in Fig. l and in dotted lines in Fig. 2. As soon as the load of the heavy spring D is applied through sear member 2| and sear 8, the member 4 is turned slightly and assumes the position shown in full .lines in Fig. 1 with the sear i then in square contact with the end H] of the trigger I I.

It will now be apparent that but a small amount of the opposed flat surfaces of the sear l and end H] of the trigger, due to the square formation thereof, need be in abutting relation in order to positively hold the member 4 in cocked position such that dropping of the rifle or jarring thereof will not be likely to release the member yet but a very short and light pull on the trigger is required to release the member 4 which is then turned by the comparatively stronger spring D as indicated in Fig. 2 thereby releasing the hammer for actuating the firing pin in the usual manner.

It should be noted that the screw l stops the releasing movement of the trigger II when the trigger has been pulled clear of the sear 1. Adjustment of the screw makes it possible to regulate the extent of movement of the trigger after clearing the sear i, but it is preferable that this movement be limited as otherwise the-spring may be distorted or deranged and too long a release movement would tend to throw the marksman ofi his aim. The loose spring keeper l4 makes it possible to adjust the screw I5 without changing the compression or form of the spring l3, thus permitting the desired fixed spring load on the trigger as a safety factor.

While I have shown and described a specific embodiment of my invention I do not limit myself to the e t details of construction set forth, and the invention embraces such changes, modifications and equivalents of the parts and their formation and arrangement as come within the purview of the appended claims.

7 the rotary member to a position in which the hammer is released and moves past the pivoted sear when said rotary member is released by said trigger; said spring-loaded sear being arranged to be depressed by said hammer while the latter is being returned to cooking position and to spring into hammer-holding position when the hammer reaches cocking position, spring means for returning the rotary member to a holding position in which the spring-loaded sear will spring into hammer-holding position when the hammer is returned to cooking position, a stop means for limiting the return of the rotary member to said holding position, and spring means for returning the trigger to holding contact with said triggercontacting sear when said rotary member is returned to said holding position.

2. In a trigger mechanism for a firearm having a spring-loaded hammer and a support for the trigger mechanism; a rotary sear-supporting member on said support, a trigger pivoted on said support, a trigger-contacting sear on said rotary member for releasably holding the rotary member against turning, a spring-loaded hammercontacting sear pivoted on said rotary member .for holding said hammer cocked when said rotary member is'he'ld against turning by said trigger and .its associated sear and which under the force of the spring load on the hammer drives the rotary member to a position in which the hammer is released and moves past the pivoted sear when said rotary member is released by said trigger; said spring-loaded sear being arranged to bodepressed by said hammer while the latter is being returned to cocking position and to spring into hammer-holding position when the hammer reaches cocking position, spring means for returning the rotary member to a holding position in which the spring-loaded sear will spring into hammer-holding position when the hammer is returned to cooking position, a stop means for limiting the return of the rotary member to said holding position, and spring means for returning the trigger to holding contact with said triggercontacting sear when said rotary member is re turned to said holding position and stop means for limiting the releasing movement of said trigger.

3. In a trigger mechanism for firearm having a spring-loaded hammer and a support for the trigger mechanism; a sear-supporting disk rotatably mounted on said support, a trigger pivoted on said support having a fiat surface on one end, a trigger-contacting sear en the periphery of said disk having flat surface for contact with the ilat surface on said end of said trigger to hold said disk against rotation, spring means yieldingly holding said trigger in contact with said sear, a sear member fixed on said hammer, a pivoted sear on said disk having a flat sear face for contact with the sear member on the hammer ior holding the latter in cocked 5 position when said disk is held against rotation, spring means urging the pivoted sear into ham mer-holding position, said disk being turned under the force of the spring load on the hammer when the trigger is pulled free of contact with the trigger contacting sear, and a spring of less force than the spring load on the hammer operating when the hammer has completed its firing stroke to return the disk to a holding position such that the trigger will spring back into holding contact with the trigger-contactin scar, and the pivoted sear will spring into hammerholcling position when the hammer is returned to cocked position.

4. In a trigger mechanism for a firearm having a spring-loaded hammer and a support for the trigger mechanism; a sear-supporting disk rotatably mounted on said support, a trigger pivoted on said support having a fiat surface on one end, a trigger-contacting sear on the periphery of said disk having a fiat surface for contact with the flat surface on said end of said trigger to hold said disk against rotation, spring means yieldingly holding said trigger in contact with said sear, a sear member fixed on said hammer, a pivoted sear on said disk having a flat sear face for contact with the sear member on the hammer for holding the latter in cocked position when said disk is held against rotation, spring means urging the pivoted sear into hammer-holding position, said disk being turned under the force of the spring load on the hammer when the trigger is pulled free of contact with the trigger contacting sear, and spring of less force than the spring load on the hammer operating when the hammer has completed its firing stroke to return the disk to a holding position such that the trigger will spring back into holding contact with the trigger-contacting sear and the pivoted sear will spring into hammer- 4 holding position when the hammer is returned to cocked position and stop means for limiting the return movement of said disk to said holding position.

5. In a trigger mechanism for a firearm having a spring-loaded hammer and a support for the trigger mechanism; a sear-supporting disk rotatably mounted on said support, a trigger pivoted on said support having a flat surface on one end, a trigger-contacting sear on the periphery of said disk having a fiat surface for contact with the fiat surface onsaid end of said trigger to hold said disk against rotation, spring means yieldingly holding said trigger in contact with said sear, a sear member fixed on said hammer, a pivoted sear on said disk having a flat sear face for contact with the sear member on the hammer for holding the latter in cocked position when said disk is held against rotation, spring means urging the pivoted sear into hammerholding position, said disk being turned under the force of the spring load on the hammer when the trigger is pulled free of contact with the trigger contacting scar, and spring of less force than the spring load on the hammer operating when the hammer has completed its firing stroke to return the disk to a holding position such that the trigger will spring back into holding contact with the trigger-contacting sear and the pivoted sear will spring into hammer-holding position when the hammer is returned to cocked position and stop means for limiting the return movement of said disk to said holding position and adjustable stop means for limiting the releasing movement of the trigger.

ARTHUR B. CUBBAGE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 915,087 Flyberg Mar. 16, 1909 2,125,350 Loomis Aug. 2, 1938 2,249,231 Smith July 15, 1941 2,249,232 Smith July 15, 1941 

